gridlabel为什么这样咨询

[wuxiaohui0]

    for entity in instance["ner"]:
        index = entity["index"]
        for i in range(len(index)):
            if i + 1 >= len(index):
                break
            _grid_labels[index[i], index[i + 1]] = 1
        _grid_labels[index[-1], index[0]] = vocab.label_to_id(entity["type"])
    # _grid_labels：

    """
    [[0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
    [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]]

想问一下关于gridlabel的问题，把上三角相应的开始和结束位置设置为1，下三角设置为对应的实体类型对应的标签，这样做的目的是啥呢